上拉刷新、下拉加载_上来刷新加载

思路：
listView来做

效果图：

mainActivity

package com.maker_huige.myapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.BaseAdapter;
import android.widget.TextView;

import com.maker_huige.ui.RejectListView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    RejectListView rl;
    ArrayList<String> strings;
    MyAdapter adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        initUI();
        rl.setRejectListener(new RejectListView.OnRejectListener(){
            @Override
            public void onReject() {
                new Thread(){
                    @Override
                    public void run() {
                        try {
                            Thread.sleep(200);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                        strings.add(0,"我是下拉出来的数据");
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                adapter.notifyDataSetChanged();
                                rl.onRejectComplete();//刷新结束，恢复界面效果
                            }
                        });
                    }
                }.start();
            }

            @Override
            public void onLoadMore() {
                new Thread(){
                    @Override
                    public void run() {
                        try {
                            Thread.sleep(200);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                        strings.add("我是加载更多出来的数据");
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                adapter.notifyDataSetChanged();
                                rl.onRejectComplete();//刷新结束，恢复界面效果
                            }
                        });
                    }
                }.start();
            }
        });
        adapter = new MyAdapter();
        rl.setAdapter(adapter);
    }

    private void initUI() {
        rl = (RejectListView) findViewById(R.id.listview);
        strings = new ArrayList<String>();
        for(int i = 0; i< 30; i++){
            strings.add("这是一个listView" + i);
        }
    }
    class MyAdapter extends BaseAdapter{
        @Override
        public int getCount() {
            return strings.size();
        }

        @Override
        public View getView(int i, View view, ViewGroup viewGroup) {
            TextView textView = new TextView(getApplicationContext());
            textView.setText(getItem(i));
            textView.setTextSize(26f);
            return textView;
        }

        @Override
        public String getItem(int i) {
            return strings.get(i);
        }

        @Override
        public long getItemId(int i) {
            return i;
        }
    }
}
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activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.maker_huige.myapplication.MainActivity">
    <com.maker_huige.ui.RejectListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </com.maker_huige.ui.RejectListView>

</LinearLayout>
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RejectListView

package com.maker_huige.ui;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.RotateAnimation;
import android.widget.AbsListView;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;

import com.maker_huige.myapplication.R;

import java.text.SimpleDateFormat;


public class RejectListView extends ListView implements AbsListView.OnScrollListener{
    View mHeader_view;
    int mMeasuredHeight;
    float Down_y;
    float Move_y;
    public static final int PULL_TO_REFRESH = 0;//下拉刷新
    public static final int RELEASE_REFRESH = 1;//释放刷新
    public static final int REFRESHING = 2;     //刷新中
    int currentState = PULL_TO_REFRESH;
    RotateAnimation rotate_up;
    RotateAnimation rotate_dow;
    ImageView mArrowView;
    ProgressBar mPb;
    TextView mTitle;
    TextView mDes;
    View mFooterView;
    boolean isLoadMore;
    int mFooterdHeight;
    private OnRejectListener onRejectListener;

    public RejectListView(Context context) {
        super(context);
        init();
    }

    public RejectListView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public RejectListView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        initHeader();
        initAnimation();
        initFooter();
        setOnScrollListener(this);
    }

    private void initFooter() {
        mFooterView = View.inflate(getContext(), R.layout.listview_footer, null);
        mFooterView.measure(0,0);
        mFooterdHeight = mFooterView.getMeasuredHeight();
        addFooterView(mFooterView);
    }

    private void initAnimation() {
        // 向上转, 围绕着自己的中心, 逆时针旋转0 -> -180.
        rotate_up = new RotateAnimation(0f,-180f, Animation.RELATIVE_TO_SELF,0.5f,
                Animation.RELATIVE_TO_SELF,0.5f);
        rotate_up.setDuration(500);
        rotate_up.setFillAfter(true);

        // 向下转, 围绕着自己的中心, 逆时针旋转 -180 -> -360
        rotate_dow = new RotateAnimation(-180f,-360f, Animation.RELATIVE_TO_SELF,0.5f,
                Animation.RELATIVE_TO_SELF,0.5f);
        rotate_dow.setDuration(500);
        rotate_dow.setFillAfter(true);
    }

    private void initHeader() {
        mHeader_view = View.inflate(getContext(), R.layout.listview_header,null);
        //提前手动测量宽高
        mHeader_view.measure(0,0);
        mMeasuredHeight = mHeader_view.getMeasuredHeight();
        mHeader_view.setPadding(0,-mMeasuredHeight,0,0);
        mArrowView = (ImageView) mHeader_view.findViewById(R.id.arrowView);
        mPb = (ProgressBar) mHeader_view.findViewById(R.id.pb);
        mTitle = (TextView) mHeader_view.findViewById(R.id.tv_title);
        mDes = (TextView) mHeader_view.findViewById(R.id.tv_des);

        addHeaderView(mHeader_view);
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        switch (ev.getAction()){
            case MotionEvent.ACTION_DOWN:
                Down_y = ev.getY();
                break;
            case MotionEvent.ACTION_MOVE:
                Move_y = ev.getY();
                if (currentState == REFRESHING){
                    return super.onTouchEvent(ev);
                }
            float offset = Move_y - Down_y;//移动的偏移量
            //只有偏移量>0,并且当前第一个可见条目索引是0，才放大头部
            if(offset>0 && getFirstVisiblePosition() == 0){
//                    int paddingTop = -自身高度 + 偏移量
                    int paddingTop = (int)(-mMeasuredHeight + offset);
                    mHeader_view.setPadding(0,paddingTop,0,0);
                    if(paddingTop >= 0 && currentState != RELEASE_REFRESH){//头部完全显示
                        //切换成释放刷新模式
                        currentState = RELEASE_REFRESH;
                        //更新最新的状态值，并更新头部内容
                        updateHeader();
                    }else if(paddingTop <0 && currentState != PULL_TO_REFRESH){
                        //切换成下拉刷新模式
                        currentState = PULL_TO_REFRESH;
                        //更新最新的状态值，并更新头部内容
                        updateHeader();
                    }
                    return true;//当前事件被我们处理并消费
                }
            break;
            case MotionEvent.ACTION_UP:
            if (currentState == PULL_TO_REFRESH){
                    mHeader_view.setPadding(0,-mMeasuredHeight,0,0);
                }else if (currentState == RELEASE_REFRESH){
                    mHeader_view.setPadding(0,0,0,0);
                    currentState = REFRESHING;
                    updateHeader();
                }
            break;
        }
        return super.onTouchEvent(ev);
    }

    private void updateHeader() {
        switch (currentState){
            case RELEASE_REFRESH://释放刷新模式
                mArrowView.startAnimation(rotate_up);
                mTitle.setText("释放刷新");
                break;
            case PULL_TO_REFRESH://下拉刷新模式
                mArrowView.startAnimation(rotate_dow);
                mTitle.setText("下拉刷新");
                break;
            case REFRESHING://刷新中
                mArrowView.clearAnimation();
                mArrowView.setVisibility(View.INVISIBLE);
                mPb.setVisibility(View.VISIBLE);
                mTitle.setText("正在刷新中...");
                if (onRejectListener != null){
                    onRejectListener.onReject();//通知调用者，让其网络加载更多数据
                }
                break;
        }
    }

    public void onRejectComplete() {
        if (isLoadMore){
            //加载更多
            mFooterView.setPadding(0,-mFooterdHeight,0,0);
            isLoadMore = false;
        }else{
            //下拉刷新
            currentState = PULL_TO_REFRESH;
            mTitle.setText("下拉刷新");
            mHeader_view.setPadding(0,-mMeasuredHeight,0,0);
            mPb.setVisibility(View.INVISIBLE);
            mArrowView.setVisibility(View.VISIBLE);
            String time = getTime();
            mDes.setText("最后刷新时间" + time);
        }
    }

    public void setRejectListener(OnRejectListener onRejectListener) {
        this.onRejectListener =onRejectListener;
    }

    private String getTime() {
        long millis = System.currentTimeMillis();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return  format.format(millis);
    }

    /**会用到原码的一些常量
     *  int SCROLL_STATE_FLING = 2;滑翔
        int SCROLL_STATE_IDLE = 0;空闲
        int SCROLL_STATE_TOUCH_SCROLL = 1;触摸滑动
     * @param absListView
     * @param i
     */
    @Override
    public void onScrollStateChanged(AbsListView absListView, int i) {
        if (isLoadMore){
            return;
        }
        //状态更新的时候
        if(i == SCROLL_STATE_IDLE && getLastVisiblePosition() >= getCount()-1){
            isLoadMore = true;
            mFooterView.setPadding(0,0,0,0);
            setSelection(getCount());

            if (onRejectListener != null){
                onRejectListener.onLoadMore();
            }
        }
    }

    @Override
    public void onScroll(AbsListView absListView, int i, int i1, int i2) {
        //滑动过程
    }

    public interface OnRejectListener{
        void onReject();//下拉刷新
        void onLoadMore();//加载更多
    }
}
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listview_header.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:padding="5dp"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <FrameLayout
        android:layout_width="50dp"
        android:layout_height="50dp">
        <ImageView
            android:id="@+id/arrowView"
            android:layout_gravity="center"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:src="@mipmap/common_listview_headview_red_arrow"/>
        <ProgressBar
            android:id="@+id/pb"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:visibility="invisible"
            />
    </FrameLayout>
    <LinearLayout
        android:layout_marginLeft="10dp"
        android:gravity="center"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <TextView
            android:id="@+id/tv_title"
            android:textColor="#f00"
            android:textSize="26dp"
            android:text="下拉更新"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <TextView
            android:id="@+id/tv_des"
            android:singleLine="true"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#000"
            android:textSize="16dp"
            android:text="2016年12月27日15:28:11"
            />
    </LinearLayout>
</LinearLayout>
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listview_footer.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:gravity="center"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ProgressBar
        android:layout_margin="5dp"
        android:layout_width="50dp"
        android:layout_height="50dp" />
    <TextView
        android:layout_marginLeft="5dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="26dp"
        android:textColor="#f00"
        android:text="加载更多"
        />
</LinearLayout>
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